======Synopsis:======
[[on]] [<modes>]exec_prompt [<serial#>] [-|^]<match> { <action> }

======Description:======
This hook is triggered whenever an [[exec command|EXEC]]ed process displays a "prompt".
More precisely, it is triggered when the process returns any line of
output that is not terminated by a newline.  This is generally the case
with interactive commands, such as nslookup(1).

======Parameters:======
|$0   |process number of name of the [[exec command|EXEC]]ed process          |
|$1   |prompt string to look for                                              |

======Default behavior:======
If you do not suppress this event, the client will format the message
and display it to your screen **UNLESS** you are redirecting the output
of that [[exec]] to somewhere else.

======Examples:======
To hook the prompt when using nslookup interactively:
   on ^exec_prompt "% >" {
      assign foo $0
      input "nslookup> " {
         msg %${foo} $*
      }
   }